From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CF651C432C0 for ; Sat, 23 Nov 2019 20:20:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 92D2420679 for ; Sat, 23 Nov 2019 20:20:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726676AbfKWUUC (ORCPT ); Sat, 23 Nov 2019 15:20:02 -0500 Received: from mail-io1-f71.google.com ([209.85.166.71]:50155 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with 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MIME-Version: 1.0 X-Received: by 2002:a92:4899:: with SMTP id j25mr23913376ilg.127.1574540401137; Sat, 23 Nov 2019 12:20:01 -0800 (PST) Date: Sat, 23 Nov 2019 12:20:01 -0800 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000004b60ec059809412f@google.com> Subject: Re: INFO: rcu detected stall in hub_event From: syzbot To: andreyknvl@google.com, benjamin.tissoires@redhat.com, jikos@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Hello, syzbot has tested the proposed patch but the reproducer still triggered crash: INFO: rcu detected stall in hub_event rcu: INFO: rcu_sched self-detected stall on CPU rcu: 1-...!: (10494 ticks this GP) idle=5aa/1/0x4000000000000002 softirq=3913/3913 fqs=1 (t=10500 jiffies g=2825 q=35) rcu: RCU grace-period kthread stack dump: running task 29704 10 2 0x80004000 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4136 schedule_timeout+0x440/0xb20 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1639 [inline] rcu_gp_kthread+0xaff/0x29e0 kernel/rcu/tree.c:1799 kthread+0x318/0x420 kernel/kthread.c:255 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: nmi_cpu_backtrace.cold+0x55/0x96 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b0/0x1c7 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x169/0x1b3 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2795 [inline] rcu_sched_clock_irq.cold+0x4da/0x936 kernel/rcu/tree.c:2244 update_process_times+0x25/0x60 kernel/time/timer.c:1726 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:167 tick_sched_timer+0x42/0x130 kernel/time/tick-sched.c:1299 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x303/0xc60 kernel/time/hrtimer.c:1576 hrtimer_interrupt+0x2e8/0x730 kernel/time/hrtimer.c:1638 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0xf5/0x500 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 Code: 00 83 fb ff 75 d6 e9 db fc ff ff e8 9d 7b 15 00 e8 68 a8 1a 00 41 56 9d e9 b1 fd ff ff e8 8b 7b 15 00 e8 56 a8 1a 00 41 56 9d 2a ff ff ff 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 RSP: 0018:ffff8881d932e908 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RDX: 0000000000000000 RSI: ffff8881da24e918 RDI: ffff8881da24e84c R10: fffffbfff11aadad R11: ffffffff88d56d6f R12: 0000000000000045 R13: ffff8881da211800 R14: 0000000000000293 R15: 0000000000000000 dev_vprintk_emit+0x4fc/0x541 drivers/base/core.c:3315 dev_printk_emit+0xba/0xf1 drivers/base/core.c:3326 __dev_printk+0x1db/0x203 drivers/base/core.c:3338 _dev_info+0xd7/0x109 drivers/base/core.c:3384 hid_parse include/linux/hid.h:1017 [inline] ms_probe+0x12d/0x4d0 drivers/hid/hid-microsoft.c:388 hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2225 driver_probe_device+0x104/0x210 drivers/base/dd.c:721 __device_attach+0x217/0x360 drivers/base/dd.c:894 device_add+0xae6/0x16f0 drivers/base/core.c:2202 hid_add_device drivers/hid/hid-core.c:2381 [inline] hid_add_device+0x33c/0x9a0 drivers/hid/hid-core.c:2330 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 driver_probe_device+0x104/0x210 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266 driver_probe_device+0x104/0x210 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0xae6/0x16f0 drivers/base/core.c:2202 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2537 hub_port_connect drivers/usb/core/hub.c:5184 [inline] hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] port_event drivers/usb/core/hub.c:5470 [inline] hub_event+0x1df8/0x3800 drivers/usb/core/hub.c:5552 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 process_scheduled_works kernel/workqueue.c:2331 [inline] worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417 kthread+0x318/0x420 kernel/kthread.c:255 Tested on: commit: 46178223 usb: gadget: add raw-gadget interface git tree: https://github.com/google/kasan.git console output: https://syzkaller.appspot.com/x/log.txt?x=12ee73cee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=99c88c44660624e7 dashboard link: https://syzkaller.appspot.com/bug?extid=ec5f884c4a135aa0dbb9 compiler: gcc (GCC) 9.0.0 20181231 (experimental) patch: https://syzkaller.appspot.com/x/patch.diff?x=14d21c22e00000